Concentric Sky rebuilt the site from the ground up in order to take advantage of newer technologies.

“It may sound surprising, but this actually saved us a lot of time,” Mike Biglan, Concentric Sky’s chief technology officer, said on a blog about the project.

The site integrates YouTube video sharing as well as social media, such as Twitter and Facebook. It ranks among the 10,000 Web sites with the most traffic in the United States.

Simon Willison, one of the creators of the Django Web framework that Concentric Sky used to create MichaelMoore.com, called it “a seriously impressive case-study,” in a recent blog.

For competitive reasons, Skipper declined to disclose the size of the contract, whether it contributes significantly to the firm’s annual earnings, or how many person hours it took to complete the project.

Skipper founded Concentric Sky in 2005. About 35 people work for the company — roughly 20 are employees, and 15 are contractors, he said.

The firm develops Web applications for major clients in education and business, as well as mobile applications, such as the Astronomy Picture of the Day iPhone application, which was developed in partnership with NASA.

Concentric Sky has fared well in the recession, Skipper said.

“I’ve seen more growth this year than I’ve seen in any prior years,” he said. “I think it’s partially because of our focus on high-end development.”

Over the years, Concentric Sky has built quite a reputation in the industry, Skipper said.

“That’s years of work, and it is paying off,” he said. “We frequently have large customers from around the world approach us. I think that’s the key thing — people tend to approach us.”

Skipper said Concentric Sky is happy to be based in Eugene.

“We’re glad to be in Eugene,” he said. “We think of it as a great opportunity to bring this kind of work to Eugene.”